KONGSBERG, Norway, Oct 15 (Reuters) - The man who killed five people with a bow-and-arrow and other weapons in Norway was probably suffering from mental illness, police said on Friday, Oct. 15.

The attacker went on a half-hour rampage in the southern town of Kongsberg on Wednesday, Oct. 13, assaulting people in the streets and forcing his way into houses and one supermarket.

Police arrested a suspect the same day - Espen Andersen Braathen, a 37-year-old Danish citizen who has lived in Kongsberg for most of his life.

Officers had looked into several lines of inquiry, including "anger, revenge, impulse, jihad, illness, provocation," police inspector Per Thomas Omholt told a news conference.

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"The hypothesis that has been strengthened the most in the first days of the investigation is that the background is illness," Omholt said.

The suspect was being held in a locked "psychiatric institution" and other lines of inquiry were still being pursued, he added.

Four women and one man between 50 and 70 years old were killed in the attacks in Kongsberg, a town and municipality about 40 miles west of the capital, Oslo. Three people were wounded including an off-duty police officer.

Police continue work in Kongsberg after Wednesday's attack where a man killed five people by a bow-and-arrow attack, in Kongsberg, Norway, October 15, 2021. Terje Pedersen NTB/via REUTERS
Police continue work in Kongsberg after Wednesday's attack where a man killed five people by a bow-and-arrow attack, in Kongsberg, Norway, October 15, 2021. Terje Pedersen NTB/via REUTERS

A student told Reuters how he and his friends shut themselves in his bedroom as the attacker tried to get into his home.

Police had earlier said Braathen was a convert to Islam who had shown signs of radicalization, with the attack appearing to be an "act of terror."

On Friday, Omholt said Braathen had acknowledged killing the victims but had not pleaded guilty.

Determining whether the attack was an act of terrorism or the result of a psychiatric issue "will be a vital, important part of the investigation," the head of the PST security police, Hans Sverre Sjoevold, told Reuters on Thursday.

Prime Minister Jonas Gahr Stoere, who took office a day after the attacks, will visit Kongsberg on Friday with Justice Minister Emilie Enger Mehl.

The death toll was the worst of any attack in Norway since 2011, when far-right extremist Anders Behring Breivik killed 77 people, most of them teenagers at a youth camp.

Police have said Braathen is cooperating with the investigation. Any trial will not take place for months.

Earlier on Friday, a court ruled Braathen could be held for up to four weeks in pre-trial detention.

People stand around flowers and candles displayed in the town center after a deadly attack, in Kongsberg, Norway, October 14, 2021. Terje Bendiksby/NTB/via REUTERS
People stand around flowers and candles displayed in the town center after a deadly attack, in Kongsberg, Norway, October 14, 2021. Terje Bendiksby/NTB/via REUTERS

(Reporting by Victoria Klesty and Nora Buli, writing by Terje Solsvik, editing by Gwladys Fouche, John Stonestreet and Andrew Heavens